how to select the parts/objects in an image

I want to select the specific parts of an image, like I have a plant image and in that iamge I need to to select/highlight/ the flowers and other parts, how to do that plz guide, what is the best way to do that?

Answer 1

[Sarvesh Kale]

Hi Aiman Zara,

If you are trying to segment an image then you can do the following

img=imread('peppers.png');
imageSegmenter(img)

An Image segmentation App will open which will allow you to highlight the specific patches in image. Follow the steps

1. open App using the imageSegmenter(img)
2. Select Draw ROIs
3. Select freehand drawing and highlight the parts you want in image
4. Exit ROI
5. Click on export

More information on image segmentation can be found in the following documentation

https://in.mathworks.com/help/images/examples.html?category=image-segmentation&s_tid=CRUX_topnav

If you want to crop a part of image and further use the image patch for image processing then take a look at imcrop function

the documentation link is https://in.mathworks.com/help/images/ref/imcrop.html

I hope this helps your query, please accept the answer if it does

Thank you

[Aiman Zara]

@Sarvesh Kale Thanks for guiding me, also please tell me if there are ways to count the particular objects in an image?

[Sarvesh Kale]

you can take a look at regionprops documentation for counting objects in an image

[Aiman Zara]

unfortunately that didnot work for me, is their anyother way? I am attaching refernce pic to get you an idea to help me more.

[Sarvesh Kale]

I have ran out of ideas, do not want to keep you waiting !

Answer 2

[Image Analyst]

See my Image Segmentation Tutorial in my File Exchange:

Image Analyst's File Exchange

It's a generic, general purpose demo of how to threshold an image to find blobs, and then measure things about the blobs, and extract certain blobs based on their areas or diameters.

You can also try my other demos in there on color segmentation, or you can try the Color Thresholder on the Apps tab of the tool ribbon.

[Aiman Zara]

@Image Analyst when I run that code it says: Error using nargon. As I am a beginner, dont know much coding, the code you shared is quite large for me to handle. Can u please specify the code for detecting specific objects in an image and then counting those specified objects? Sample pictures are attached from which I need to detect objects/part in an image and after detecting i need to count them too.

[Image Analyst]

In a nutshell, here are the essentials of image processing:

mask = grayImage > someThreshold;
props = regionprops('table', mask);

If you want more details, then that's what my tutorial does in well-commented, excruciating detail.